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Assume that you have a client in a Microsoft Lync Server 2010 environment. The client accepts a call by using a third-party voice mail device or forwards a call to a third-party voice mail device. In this situation, you receive the following error message from Lync Server 2010 Mediation Server:

488 Not Acceptable Here

Note This error message indicates that media negotiation on the gateway side of third-party voice mail system failed because a Session Description Protocol (SDP) response contained a bandwidth field that the SDP did not expect.


This issue occurs because the SDP cannot handle multiple bandwidth values.


To resolve this issue, install the following cumulative update:

2847888 Description of the cumulative update for Lync Server 2010, Unified Communications Managed API 3.0 Runtime: July 2013

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